Rainstones have the following meanings:
Rainstones are stones used for rainmaking magic performances.
That is, Yuhua Stone. Yuan Ma Zuchang's poem "Deng Yuhuatai": "Raining stones meet arrows, and windy forests catch phoenix feathers."
"Raining Stones" is a cartoon directed by Lan Tiankefan, with Lu Fan and Ye Shan participating in the performances.